Self-grinding valve



Jan. 20, 1925' 1,5 3,965

c. F. HOWELL SELF GRINDING VALVE Filed June 25, 1924 ATTORNEYS BY avg/M; M1330 Patented Jan. 20, 1925.

UNITED STATES CHARLES FRANK HOWELL, OF ST. PETERSBURG, FLORIDA.

SELF-GRINDING VALVE.

Application filed June 25, 1924. Serial No. 722,316.

T 0 all whomit may concern:

Be it known that I, CHARLES F. HOWELL, a citizen of the United States, and a resident of St. Petersburg, in the county of Pinellas and State of Florida, have invented a new and Improved Self-Grinding Valve, of which the following is a full, clear, and exact description.

This invention relates to valves for gasoline engines and particularly to an improved self grinding valve.

The object of the invention is to provide a valve structure which will function in the usual manner but which during its movement, will automatically rotate at a slow speed under the action of the pressure from the explosive mixture.

Another object of the invention, more specifically, is to provide a poppet valve for internal combustion engines wherein one face is grooved in such a manner that as the valve seats it will rotate to a very small extent while engaging its seat.

In the accompanying drawing- Figure 1 is a fragmentary sectional view through part of an internal combustion engine, disclosing a valve embodying the invention.

Figure 2 is a top plan view of the valve shown in Figure 1.

Referring to the accompanying drawing by numerals, 1 indicates an internal combustion engine of any desired kind which is provided with a valve seat 2 for accommodating the valve 8, which valve is provided with a beveled or inclined face 4 engaging the seat 2. The valve 3 is provided with the usual stem 5 which is seated and un seated in the usual manner or in any preferred manner. The construction described so far is old and well known.

The improvement consists in means performed in the valve 3 for causing the same to rotate either after it is seated or immediately on seating. This means consists in providing one or more grooves 6 in the upper face of the valve 3. Each of these grooves, whether there is one or several, is provided with a vertical wall 7 and an inclined wall 8. Wall 7 extends radially and preferably from near the center to near the periphery, while wall 8 is arranged on an are, as clearly illustrated in Figure 2. If the face 4 and the seat 2 are perfect and match perfectly and if the other parts also operate in a perfect manner, the face 4C will fit exactly the seat 2 and there will be no movement or at the best, very little movement but if either the seat 2 or the face 4 is not perfect but somewhat irregular, the pressure on the wall 8 will cause an appreciable rotary movement of the valve after it has engaged its seat. When the valve first engages its seat, it will naturally rest 011 the high points. As the pressure on top of the valve increases, the valve will be crowded down tightly against its seat and in this last movement the action of the pres sure against the wall 8 will be apparent as it causes a slight rotary motion sufficient to produce a very slight grinding. If there is only one groove 6, a certain motion will be produced while if there are two a greater motion will be produced and if there are more than two a still greater rotary motion will be eflected up to certain limits. However, in using valves of this kind, it is undesirable to have too much movement and, conequently, a desirable structure is found to be the structure using two grooves 6 as shown in the drawing. This will permit a sufficient movement to maintain the valve and its seat properly ground to produce the desired gas tight fit.

What I claim is:

1. A valve for an internal combustion engino, comprising a valve body having a seat engaging face, and a groove arranged on the opposite side to said face, said groove having a vertical wall and an inclined wall.

2. A self grinding valve for internal combustion engines, comprising a body formed with a face adapted to engage a seat, and a face provided with a plurality of grooves extending from near the periphery towards the center, each groove having a wall extending at right angles to the upper face of the valve and a wall at an appreciable angle thereto.

8. A self cleaning poppet valve for internal combustion engines, comprising a body having on one face a plurality of grooves formed as segments of circles extending substantially radially and provided with two walls, one wall being substantially at right angles to the face of the valve and the other at an appreciable angle thereto.

CHARLES FRANK HOWELL. 

